Incongruent Melting of the High Temperature Superconductor YBa2Cu3O7

摘要

A study has been made of the melting of the high temperature superconductor YBa/sub 2/Cu/sub 3/O/sub 7/. The material was found to melt at 980/degree/C in an atmosphere of argon 20% oxygen. In a commercial oxygen atmosphere the melting temperature was found to increase by approximately 20/degree/C. Above the melting point the material consisted of a molten phase of BaCuO/sub 2/-Cu/sub 2/O-CuO and solid Y/sub 2/BaCuO/sub 7/. Subsequent heat treating at 940/degree/C restores the superconducting phase. 5 refs., 2 figs. (ERA citation 14:007051)